James Stroud wrote:
Hello,
I am looking for a nice way to take only those charachters from a string that
are in another string and make a new string:
astr = "Bob Carol Ted Alice"
letters = "adB"
some_func(astr,letters)
"Bad"
I can write this like this:
astr = "Bob Carol Ted Alice"
letters = "adB"
import sets
alist = [lttr for lttr in astr if lttr in Set(letters)]
newstr = ""
for lttr in alist:
newstr += lttr
But this seems ugly. I especially don't like "newstr += lttr" because it makes
a new string every time. I am thinking that something like this has to be a
function somewhere already or that I can make it more efficient using a
built-in tool.
Any ideas?
James
How about:
>>> astr = "Bob Carol Ted Alice"
>>> letters = "adB"
>>> "".join(letter for letter in astr if letter in set(letters))
'Bad'
>>>
Michael
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